Array substrate and display device having the same

Abstract

An array substrate includes a first pixel electrode and a second pixel electrode. The first pixel electrode includes first branch electrode portions and second branch electrode portions. The first branch electrode portions are disposed in a first area of a unit pixel area and are substantially parallel to a first side of the unit pixel area. The second branch electrode portions are disposed in a second area of the unit pixel area and are substantially parallel to a second side of the unit pixel area. The second pixel electrode includes third branch electrode portions disposed between the first branch electrode portions and fourth branch electrode portions disposed between the second branch electrode portions.

Description

[0001]This application claims priority to Korean Patent Application No. 2009-12448, filed on Feb. 16, 2009, and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which in its entirety are herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an array substrate and a display device having the array substrate. More particularly, the present invention relates to an array substrate having a substantially horizontal electric field and a display device having the array substrate.[0004]2. Description of the Related Art[0005]A liquid crystal display (“LCD”) device is a widely used type of flat panel display device. An LCD device typically includes two display substrates having electrodes, such as a pixel electrode and a common electrode, for generating an electric field disposed thereon, and a liquid crystal layer disposed between the two display substrates. When a voltage is applied to the e...

AI Technical Summary

Benefits of technology

[0008]Exemplary embodiments provide an array substrate having substantially decreased textures, resulting in significantly enhanced transmittance and response time of liquid crystals therein, thereby substantially enhancing a display quality thereof.

[0013]Thus, in an array substrate and a display device having the array substrate according to an exemplary embodiment, an area for forming an angle of about 45 degrees between an alignment direction of liquid crystals and a polarization axis thereof are significantly increased to substantially enhance transmittance. Moreover, a driving voltage which forms a substantially horizontal electric field is significantly increased, and response time is thereby substantially enhanced. Therefore, a display quality of the display device including the array substrate is substantially enhanced.

Problems solved by technology

Obtaining a wide viewing angle and a fast response time of the liquid crystal layer is an important issue in LCD technology.

However, the liquid crystals in a boundary area of domains of the multi-domain structure are insufficiently controlled, and textures are generated in the boundary area, thereby substantially decreasing light transmittance, causing a substantially deterioration of the display quality of the LCD.

In addition, an amplitude of a driving voltage applied to the electrodes is substantially limited, due to a width of a line which delivers a signal to a switching element of the LCD.

As a result, it is impossible to increase a voltage potential difference of the electric field applied to the liquid crystal layer to enhance the response time of the LCD device and / or to effectively drive the LCD using low and high driving voltages thereof.

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